package org.apache.maven.model.io;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.util.Map;

import org.apache.maven.model.InputSource;
import org.apache.maven.model.Model;
import org.apache.maven.model.io.xpp3.MavenXpp3Reader;
import org.apache.maven.model.io.xpp3.MavenXpp3ReaderEx;
import org.codehaus.plexus.component.annotations.Component;
import org.codehaus.plexus.util.IOUtil;
import org.codehaus.plexus.util.ReaderFactory;
import org.codehaus.plexus.util.xml.pull.XmlPullParserException;

/**
 * Handles deserialization of a model from some kind of textual format like XML.
 * 
 * @author Benjamin Bentmann
 */
@Component(role = ModelReader.class)
public class DefaultModelReader implements ModelReader {

  public Model read(File input, Map<String, ?> options) throws IOException {
    if (input == null) {
      throw new IllegalArgumentException("input file missing");
    }

    Model model = read(new FileInputStream(input), options);

    model.setPomFile(input);

    return model;
  }

  public Model read(Reader input, Map<String, ?> options) throws IOException {
    if (input == null) {
      throw new IllegalArgumentException("input reader missing");
    }

    try {
      return read(input, isStrict(options), getSource(options));
    } finally {
      IOUtil.close(input);
    }
  }

  public Model read(InputStream input, Map<String, ?> options) throws IOException {
    if (input == null) {
      throw new IllegalArgumentException("input stream missing");
    }

    try {
      return read(ReaderFactory.newXmlReader(input), isStrict(options), getSource(options));
    } finally {
      IOUtil.close(input);
    }
  }

  private boolean isStrict(Map<String, ?> options) {
    Object value = (options != null) ? options.get(IS_STRICT) : null;
    return value == null || Boolean.parseBoolean(value.toString());
  }

  private InputSource getSource(Map<String, ?> options) {
    Object value = (options != null) ? options.get(INPUT_SOURCE) : null;
    return (InputSource) value;
  }

  private Model read(Reader reader, boolean strict, InputSource source) throws IOException {
    try {
      if (source != null) {
        return new MavenXpp3ReaderEx().read(reader, strict, source);
      } else {
        return new MavenXpp3Reader().read(reader, strict);
      }
    } catch (XmlPullParserException e) {
      throw new ModelParseException(e.getMessage(), e.getLineNumber(), e.getColumnNumber(), e);
    }
  }

}
